What's the verdict on third-party platforms for customer portals?

Ecom operation with personalized products.

We do a bunch of back-end work on Airtable.

Some of that work requires sending out emails from Airtable requesting that customers approve the mockups.

I would love to be able to have a customer log in via magic link, they see the items pending approval, and they single select 'approved' or 'needs changes' and a text form for comments.

I already designed it in Softr, works great, but the app user limit is too low. We have 5000+ customers.

I tried Stacker, but they're going through an identity crisis and switching products soon (spoke with team, didn't give specifics but explained everything and basically a no go for our situation).

Which other third party platform would you recommend for this?

Ideally no-code.